EP0469783A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for image reproduction
Assignee: Scitex Corp Ltd
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Filing: 1991-07-25
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Granted: —
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Expires: 2011-07-25
Abstract
Abstract Apparatus and a technique for generating a screened reproduction of an image is disclosed. The technique includes several steps. The first step involves providing a representation of an original having input density values of the original. The second step involves storing information representing a plurality of desired dot configurations, corresponding to various possible density values. In the third step, for each coordinate pair in a given region (54), containing a multiplicity of coordinate pairs, a determination of whether the given region includes a part of a dot corresponding to the input density of the original is performed. In the fourth step, for regions which are determined to include a part of a dot, a determination is made whether a coordinate pair (50) lies within the boundary coordinates of the dot. The fifth step involves operating the plotter to write only if the coordinate pair lies inside the boundary coordinates of the dot, thereby to produce the multiplicity of screen dots of configurations representing the input density values of the original.
Inventors
- 👤 Ephraim E. Carlebach
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 23:07
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4055; H04N1/4058
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
137 words
A technique for generating a screened reproduction of an image comprising the steps of: providing a representation of an original having input density values of the original, storing information representing a plurality of desired dot configurations, corresponding to various possible density values; for each coordinate pair in a given region, containing a multiplicity of coordinate pairs, determining whether the given region includes a part of a dot corresponding to the input density of the original; in regions which are determined to include a part of a dot, determining whether a coordinate pair lies within the boundary coordinates of the dot; and operating the plotter to write only if the coordinate pair lies inside the boundary coordinates of the dot, thereby to produce a multiplicity of screen dots of configurations representing the input density values of the original.
Claim 2
Dependent Claim
126 words
A technique for generating a screened reproduction of an image comprising the steps of: providing a representation of an original having input density values of the original; storing information representing a plurality of desired dot configurations, corresponding to various possible density values for a multiplicity of screened dots; for each coordinate pair determining whether the coordinate pair lies within the boundary coordinates of the dot, including the step of determining whether at least one coordinate of the coordinate pair lies within a single corresponding boundary coordinate of the dot; and operating the plotter to write only if the coordinate pair lies inside the boundary coordinates of the dot, thereby to produce a multiplicity of screen dots of configurations representing the input density values of the original.
Claim 3
Dependent Claim
27 words
A technique according to claim 1 and wherein said step of providing a representation comprises scanning the original using a laser scanner having a first pixel resolution.
Claim 4
Dependent Claim
29 words
A technique according to claim 3 and wherein said multiplicity of screen dots are arranged in a screen grid having a second resolution, coarser than the first pixel resolution.
Claim 5
Dependent Claim
32 words
A technique according to claim 4 and wherein representation of the original is arranged in a scanner grid pattern and said screen grid is angled with respect to the scanner grid pattern.
Claim 6
Dependent Claim
25 words
A technique according to claim 1 and wherein said step of storing information comprises storing information relating to a plurality of selectable different dot configurations.
Claim 7
Dependent Claim
31 words
A technique according to claim 3 and wherein said means for operating the plotter is operative to cause the plotter to write with a resolution finer than the first pixel resolution.
Claim 8
Dependent Claim
142 words
Apparatus for generating a screened reproduction of an image comprising: means for providing a representation of an original having input density values of the original, means for storing information representing a plurality of desired dot configurations, corresponding to various possible density values; means for determining, for each coordinate pair in a given region, containing a multiplicity of coordinate pairs, firstly whether the given region includes a part of a dot corresponding to the input density of the original; means for determining, for regions which are determined to include a part of a dot, whether a coordinate pair lies within the boundary coordinates of the dot; and operating the plotter to write only if the coordinate pair lies inside the boundary coordinates of the dot, thereby to produce a multiplicity of screen dots of configurations representing the input density values of the original.
Claim 9
Dependent Claim
24 words
Apparatus according to claim 8 and wherein said means for storing information comprises storing information relating to a plurality of selectable different dot configurations.
Claim 10
Dependent Claim
30 words
Apparatus according to claim 8 and wherein said means for operating the plotter is operative to cause the plotter to write with a resolution finer than the first pixel resolution.
Claim 11
Dependent Claim
14 words
Apparatus according to claim 8 and also comprising operator control means including a workstation.
Claim 12
Dependent Claim
126 words
Apparatus for generating a screened reproduction of an image comprising: means for providing a representation of an original having input density values of the original; means for storing information representing a plurality of desired dot configurations, corresponding to various possible density values for a multiplicity of screened dots; means for determining whether the coordinate pair lies within the boundary coordinates of the dot, including the step of determining whether at least one coordinate of the coordinate pair lies within a single corresponding boundary coordinate of the dot; and means for operating the plotter to write only if the coordinate pair lies inside the boundary coordinates of the dot, thereby to produce a multiplicity of screen dots of configurations representing the input density values of the original.
Claim 13
Dependent Claim
22 words
Apparatus according to claim 12 and wherein said means for providing a representation comprises a laser scanner having a first pixel resolution.
Claim 14
Dependent Claim
28 words
Apparatus according to claim 13 and wherein said multiplicity of screen dots are arranged in a screen grid having a second resolution, coarser than the first pixel resolution.
Claim 15
Dependent Claim
31 words
Apparatus according to claim 14 and wherein representation of the original is arranged in a scanner grid pattern and said screen grid is angled with respect to the scanner grid pattern.
References Cited (Backward Citations)
No citation records indexed.
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